Shangzhuang
Qinghai, Lajishan suture (Qilian orogen), China
Magmatic (Ni-Cu-PGE, carbonatites)P-REE
- Type
- Ultramafic-alkaline and carbonatite complex with phosphorus and rare earths (apatite)
Giant P-REE deposit: 51.1 Mt P2O5 and 157,400 t REE, at 3.46 % P2O5 and 0.09 % REE on average (Wang et al., 2023); P and REE carried mainly by apatite. Biotite, fluorapatite and calcite-K-feldspar-amphibole clinopyroxenites, cut by syenite and carbonatite dykes, emplaced around 463-467 Ma (titanite U-Pb). Jiang et al. (2024): carbonatite titanite with negative δ49Ti (-1.78 to -0.49 ‰), syenite titanite with positive δ49Ti (+0.18 to +0.62 ‰), read as immiscibility of a carbonate melt and an alkaline silicate melt from one ultramafic magma.
δ49Ti in ‰ (per mil) Values of the same system
Standard : OL-Ti
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.25 ‰ | −0.5 / −0.1 ‰ | titanite (biotite clinopyroxenite, SZ2) Published mean -0.25 ‰, -0.50 to -0.10 ‰ (uncertainty 0.05 to 0.08 ‰ per spot). Formed at about 1080 ± 29 °C (clinopyroxene-melt); calculated melt +0.02-0.04 ‰. Melts calculated with Δ49Ti titanite-melt = 3815 × (323 - 457)/T² (force constants of Aarons et al., 2021). | Jiang et al. (2024), Immiscibility of carbonatitic and alkaline silicate melts from an ev… | |
| −0.25 ‰ | −0.45 / −0.03 ‰ | titanite (fluorapatite-biotite clinopyroxenite, SZ3) Published mean -0.25 ‰, -0.45 to -0.03 ‰ (uncertainty 0.05 to 0.08 ‰ per spot). Formed at about 1054 ± 15 °C; calculated melt +0.03-0.05 ‰. Melts calculated with Δ49Ti titanite-melt = 3815 × (323 - 457)/T² (force constants of Aarons et al., 2021). | Jiang et al. (2024), Immiscibility of carbonatitic and alkaline silicate melts from an ev… | |
| −0.06 ‰ | −0.38 / 0.11 ‰ | titanite (calcite-K-feldspar-amphibole clinopyroxenite, SZ5) Published mean -0.06 ‰, -0.38 to +0.11 ‰ (uncertainty 0.05 to 0.08 ‰ per spot). Formed at about 1010 ± 21 °C; calculated melt +0.24-0.26 ‰. Melts calculated with Δ49Ti titanite-melt = 3815 × (323 - 457)/T² (force constants of Aarons et al., 2021). | Jiang et al. (2024), Immiscibility of carbonatitic and alkaline silicate melts from an ev… | |
| 0.53 ‰ | 0.18 / 0.62 ‰ | titanite (syenite dyke, SZ6) Published mean +0.53 ‰, +0.18 to +0.62 ‰ (uncertainty 0.05 to 0.08 ‰ per spot). Formed at about 756 ± 55 °C (zircon saturation); calculated melt +0.96-1.07 ‰. Melts calculated with Δ49Ti titanite-melt = 3815 × (323 - 457)/T² (force constants of Aarons et al., 2021). | Jiang et al. (2024), Immiscibility of carbonatitic and alkaline silicate melts from an ev… | |
| −0.9 ‰ | −1.78 / −0.49 ‰ | titanite (carbonatite, SZ7) Published mean -0.90 ‰, -1.78 to -0.49 ‰ (uncertainty 0.05 to 0.08 ‰ per spot). Only unit depleted in heavy Ti; no temperature or melt calculated. | Jiang et al. (2024), Immiscibility of carbonatitic and alkaline silicate melts from an ev… |
εNd(t) in ε units (parts per 10,000) Values of the same system
Standard : CHUR
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −0.08 ε | −1.3 / 1 ε | titanite (biotite clinopyroxenite, SZ2) Published mean -0.08, -1.3 to +1.0; calculated at the titanite age (463-467 Ma). | Jiang et al. (2024), Immiscibility of carbonatitic and alkaline silicate melts from an ev… | |
| −0.63 ε | −1.2 / 0 ε | titanite (fluorapatite-biotite clinopyroxenite, SZ3) Published mean -0.63, -1.2 to 0.0; calculated at the titanite age (463-467 Ma). | Jiang et al. (2024), Immiscibility of carbonatitic and alkaline silicate melts from an ev… | |
| −0.7 ε | −1.7 / 0.3 ε | titanite (calcite-K-feldspar-amphibole clinopyroxenite, SZ5) Published mean -0.7, -1.7 to +0.3; calculated at the titanite age (463-467 Ma). | Jiang et al. (2024), Immiscibility of carbonatitic and alkaline silicate melts from an ev… | |
| −0.4 ε | −1.1 / 0.6 ε | titanite (syenite dyke, SZ6) Published mean -0.4, -1.1 to +0.6; calculated at the titanite age (463-467 Ma). | Jiang et al. (2024), Immiscibility of carbonatitic and alkaline silicate melts from an ev… | |
| −0.9 ε | −1.4 / −0.4 ε | titanite (carbonatite, SZ7) Published mean -0.9, -1.4 to -0.4; calculated at the titanite age (463-467 Ma). | Jiang et al. (2024), Immiscibility of carbonatitic and alkaline silicate melts from an ev… |
Deposits of the same type
- Bayan Obo China
- Norilsk-Talnakh Russia
- Bushveld, Merensky Reef South Africa
- Bushveld, UG2 chromitite South Africa
- Bushveld, Platreef South Africa
- Sudbury Canada
- Voisey's Bay Canada
- Rössing Namibia
Cite this page
IsoFind Atlas (2026). Shangzhuang, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/shangzhuang/ (accessed 2026-10-20).
@misc{isofind2026shangzhuangisotopesignatures,
title = {Shangzhuang, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/shangzhuang/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20